Implement k8s plugin's FetchDefinedStages and BuildQuickSyncStages

[Warashi]

What this PR does / why we need it:

This PR implements part of the Kubernetes plugin, FetchDefinedStages and BuildQuickSyncStages.

Which issue(s) this PR fixes:

Part of #4980

Does this PR introduce a user-facing change?: No

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Project coverage is 22.82%. Comparing base (083c810) to head (e57ffc4).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...app/pipedv1/plugin/kubernetes/deployment/server.go	0.00%	28 Missing ⚠️
pkg/app/pipedv1/plugin/kubernetes/server.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5223      +/-   ##
==========================================
+ Coverage   22.81%   22.82%   +0.01%     
==========================================
  Files         419      419              
  Lines       45304    45319      +15     
==========================================
+ Hits        10334    10344      +10     
- Misses      34174    34180       +6     
+ Partials      796      795       -1     

Flag	Coverage Δ
	22.82% <0.00%> (+0.01%)	⬆️

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